Next Customer number

I am converting data with Epicor's license version of the Pervasive
datamapper. I have included the custnum in the customer import. I
am looking to where Vantage get the next custnum, so I can prevent any
issues. Any idea where i might find such a seed record?
I am working with the Pervasive conversion tools for Vantage 8. I am
have added the custnum field to my customer imports. I can not find
where Vantage is storing the next custnum seed data. I am concerned
that the numbers I have imported may conflict with the next custnum
that the software will use. Any ideas where vantage gets this next
value from?